Meridian

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Convert times between zones with daylight saving right, see who is awake, find meeting slots.

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meridian_convert_time Read-only

Use to convert a specific wall-clock time from one place to others, for any date. It uses the real tz database, so daylight saving is right for that exact date (the US and Europe switch on different weeks), and it warns when the time does not exist (spring forward) or happens twice (fall back). Time accepts "15:00", "3:30pm", "noon", "now" or an ISO local time like 2026-11-05T15:00 (no Z). Date defaults to today in the source zone. Returns {input, utc, source:{...}, converted:[{place, zone, local, time_12h, date, utc_offset, abbreviation, day_note, hours_ahead_of_source}], warning?, summary, open_url}.

toarray, required

Destination places, e.g. ["London","Tokyo"].

fromstring, required

Source place or zone, e.g. "New York" or "America/New_York".

timestring, required

Local time in the source place, e.g. "15:00", "3:30pm", "noon", "now", "2026-11-05T15:00".

datestring

Optional date YYYY-MM-DD in the source zone. Default today.

Tools (4)

meridian_convert_time

read-only

Argument	Type	Description
to*	array	Destination places, e.g. ["London","Tokyo"].
date	string	Optional date YYYY-MM-DD in the source zone. Default today.
from*	string	Source place or zone, e.g. "New York" or "America/New_York".
time*	string	Local time in the source place, e.g. "15:00", "3:30pm", "noon", "now", "2026-11-05T15:00".

Input schema (JSON)

{
  "type": "object",
  "required": [
    "time",
    "from",
    "to"
  ],
  "properties": {
    "to": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 60,
        "minLength": 1
      },
      "maxItems": 12,
      "minItems": 1,
      "description": "Destination places, e.g. [\"London\",\"Tokyo\"]."
    },
    "date": {
      "type": "string",
      "maxLength": 10,
      "description": "Optional date YYYY-MM-DD in the source zone. Default today."
    },
    "from": {
      "type": "string",
      "maxLength": 60,
      "minLength": 1,
      "description": "Source place or zone, e.g. \"New York\" or \"America/New_York\"."
    },
    "time": {
      "type": "string",
      "maxLength": 40,
      "minLength": 1,
      "description": "Local time in the source place, e.g. \"15:00\", \"3:30pm\", \"noon\", \"now\", \"2026-11-05T15:00\"."
    }
  }
}

meridian_meeting_slots

Use to schedule a call across several places. Scans the day in 15-minute steps and ranks start times so the most people are inside working hours and nobody is at night, using each place's real offset and DST for that date. Returns up to 5 slots with each person's local start and end, and says plainly when no time works for everyone. Defaults: working hours 9 to 17, 60 minutes, date today in the first place.

read-only

Argument	Type	Description
date	string	Date YYYY-MM-DD, local to the first place. Default today.
count	integer	How many slots to return, default 5.
places*	array	Where each attendee is, e.g. ["San Francisco","London","Tokyo"].
end_hour	integer	Working day end hour, default 17.
start_hour	integer	Working day start hour, default 9.
duration_minutes	integer	Meeting length in minutes, multiple of 15. Default 60.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "places"
  ],
  "properties": {
    "date": {
      "type": "string",
      "maxLength": 10,
      "description": "Date YYYY-MM-DD, local to the first place. Default today."
    },
    "count": {
      "type": "integer",
      "maximum": 8,
      "minimum": 1,
      "description": "How many slots to return, default 5."
    },
    "places": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 60,
        "minLength": 1
      },
      "maxItems": 8,
      "minItems": 2,
      "description": "Where each attendee is, e.g. [\"San Francisco\",\"London\",\"Tokyo\"]."
    },
    "end_hour": {
      "type": "integer",
      "maximum": 24,
      "minimum": 1,
      "description": "Working day end hour, default 17."
    },
    "start_hour": {
      "type": "integer",
      "maximum": 23,
      "minimum": 0,
      "description": "Working day start hour, default 9."
    },
    "duration_minutes": {
      "type": "integer",
      "maximum": 480,
      "minimum": 15,
      "description": "Meeting length in minutes, multiple of 15. Default 60."
    }
  }
}

meridian_now

Use whenever you need to know what time or date it is right now somewhere. You have no clock of your own, so never guess the current time. Returns the real current time, date, UTC offset, abbreviation and daylight saving status for each place. Places can be cities ("Tokyo"), IANA zones ("Europe/Paris"), abbreviations ("PST") or "UTC+5:30".

read-only

Argument	Type	Description
places*	array	Cities, IANA zones or abbreviations, e.g. ["London","Asia/Tokyo"].

Input schema (JSON)

{
  "type": "object",
  "required": [
    "places"
  ],
  "properties": {
    "places": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 60,
        "minLength": 1
      },
      "maxItems": 12,
      "minItems": 1,
      "description": "Cities, IANA zones or abbreviations, e.g. [\"London\",\"Asia/Tokyo\"]."
    }
  }
}

meridian_zone_info

Use to answer "what is the UTC offset of X", "does X observe daylight saving" and "when do the clocks change". Returns the current offset and abbreviation, whether the place observes DST, every clock change in the year with exact local before and after times, and the next change. Abbreviations like IST or CST are ambiguous, so the answer says which zone was used.

read-only

Argument	Type	Description
year	integer	Year to list clock changes for. Default this year.
place*	string	City, IANA zone or abbreviation, e.g. "London" or "America/Phoenix".

Input schema (JSON)

{
  "type": "object",
  "required": [
    "place"
  ],
  "properties": {
    "year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 1970,
      "description": "Year to list clock changes for. Default this year."
    },
    "place": {
      "type": "string",
      "maxLength": 60,
      "minLength": 1,
      "description": "City, IANA zone or abbreviation, e.g. \"London\" or \"America/Phoenix\"."
    }
  }
}

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meridian_convert_time Read-only

Meridian

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meridian_convert_time Read-only

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Tools (4)

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